Edward Carl Freeman

US Patent:

45257515, Jun 25, 1985

Filed:

Aug 27, 1982

Appl. No.:

6/412185

Inventors:

Edward J. Freeman - Indianapolis IN
John E. Economou - Indianapolis IN
John G. Pecorari - Indianapolis IN
Gunter John - Indianapolis IN
Jerome B. Halter - Indianapolis IN
Jack E. James - Indianapolis IN
Richard M. Castle - Indianapolis IN
Richard C. Palmer - Blawenburg NJ

Assignee:

RCA Corporation - Princeton NJ

International Classification:

H04N 592
G11B 300

US Classification:

358342

Abstract:

A video disc record of the constant angular velocity type (CAV) includes a spiral groove of constant pitch formed in a band on a surface thereof. The groove has a substantially constant nominal vertical dimension and vertical displacements which taper monotonically from an outer radius of the band to an inner radius. One component of the vertical displacement of the groove conveys an FM carrier wave of constant amplitude and relatively high frequency representative of picture information. A second component of the vertical displacement conveys one or more lower frequency FM carrier waves representative of sound information. The amplitude of the second component varies monotonically as a function of the groove radius within the record band to provide a disc having an improved audio FM carrier-to-noise ratio with no substantial perceptible increase in undesirable sound beat effects in images displayed when the disc is played. A mastering system exemplary of the method of forming the grooved disc includes variable gain units in an audio FM carrier wave processing path of the system.